| 摘要 |
PURPOSE:To attain connection to a TTL (transistor transistor logic) circuit and to a CMOS circuit with one circuit by inserting the source of the two numbers of transistors of a P channel and the drain switch means of the transistor of an N channel and executing on and off operation with a control signal. CONSTITUTION:A switch means 900 is inserted between the two numbers of transistors 700 and 800 of the P channel and the drain of transistors 500 and 600 of the N channel. When the output of the TTL is connected to the input of a CMOS input buffer circuit, since the switch means 900 is turned off by the control signal and a threshold to identify an H level is lowered, an interface with the TTL can be obtained. On the other hand, when the other output of the other CMOS is connected to the input of the CMOS buffer circuit, the switch means 900 is turned off by the control signal and without lowering the threshold to identify the H level, the interface with the other CMOS can be obtained. Thus, the connection can be executed to the TTL circuit and the CMOS circuit by the control signal with one circuit. |
